Nouns starting with O

• order Pterosauria — Noun – English ～ extinct flying reptiles: pterosaurs
• os pubis — Noun – English ～ one of the three sections of the hipbone; together these two bones form the front of the pelvis
• order Pulmonata — Noun – English ～ large order of gastropods usually breathing by means of a lung-like sac comprising most land snails and slugs and many freshwater snails
• oil pump — Noun – English ～ a pump that keeps a supply of oil on moving parts
• order Pycnogonida — Noun – English ～ sea spiders
• Ornithogalum pyrenaicum — Noun – English ～ Old World star of Bethlehem having edible young shoots
• one-flowered pyrola — Noun – English ～ delicate evergreen dwarf herb of north temperate regions having a solitary white terminal flower; sometimes placed in genus Pyrola
• optical pyrometer — Noun – English ～ a pyrometer that uses the color of the light emitted by a hot object
• one-quadrillionth — Noun – English ～ one part in a quadrillion equal parts
• one-quarter — Noun – English ～ one of four equal parts; "a quarter of a pound"
• one-quintillionth — Noun – English ～ one part in a quintillion equal parts
• obstacle race — Noun – English ～ a race in which competitors must negotiate obstacles
• optic radiation — Noun – English ～ a nerve pathway from the lateral geniculate body to the visual cortex
• order Radiolaria — Noun – English ～ marine protozoa
• overhead railway — Noun – English ～ a railway that is powered by electricity and that runs on a track that is raised above the street level
• order Rajiformes — Noun – English ～ fish with dorsoventrally flattened bodies; includes: rays; skates; guitarfishes; sawfishes
• order Ranales — Noun – English ～ herbs, shrubs and trees: includes families Ranunculaceae; Annonaceae; Berberidaceae; Magnoliaceae; Menispermaceae; Myristicaceae; Nymphaeaceae; Lardizabalaceae; Lauraceae; Calycanthaceae; Ceratophyllaceae; Cercidiphyllaceae
• omnidirectional range — Noun – English ～ a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing
• omnidirectional radio range — Noun – English ～ a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing
• order Ranunculales — Noun – English ～ herbs, shrubs and trees: includes families Ranunculaceae; Annonaceae; Berberidaceae; Magnoliaceae; Menispermaceae; Myristicaceae; Nymphaeaceae; Lardizabalaceae; Lauraceae; Calycanthaceae; Ceratophyllaceae; Cercidiphyllaceae

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